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Production of Salmonella enteritidis-Contaminated Eggs by Experimentally Infected Hens

Richard K. Gast and C. W. Beard
Avian Diseases
Vol. 34, No. 2 (Apr. - Jun., 1990), pp. 438-446
DOI: 10.2307/1591433
Stable URL: http://www.jstor.org/stable/1591433
Page Count: 9
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Production of Salmonella enteritidis-Contaminated Eggs by Experimentally Infected Hens
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Abstract

Laying hens of three different ages were experimentally infected with a strain of Salmonella enteritidis by either oral inoculation or contact transmission. Total egg production was depressed in exposed hens of all three age groups. Persistent intestinal shedding was observed in a small number of hens. Eggs with contents contaminated by S. enteritidis were produced by exposed hens at a high frequency, but only during a fairly short period of time that extended through approximately 1 week postinoculation for older hens and through 2 weeks for younger hens. S. enteritidis was recovered from whole yolks and albumen of these eggs at similar frequencies, but not from the contents of yolks. Eggs with contaminated shells were also produced, but at a lower frequency. Contaminated eggs were produced by orally inoculated and contact-exposed hens at similar frequencies. S. enteritidis was not isolated from the contents of eggs laid by hens infected with other S. enteritidis strains. /// Gallinas ponedoras de tres edades diferentes fueron infectadas experimentalmente con una cepa de Salmonella enteritidis mediante la inoculación oral o por contacto. La producción total de huevos disminuyó en los tres grupos de gallinas infectadas. La eliminación intestinal persistente del microorganismo fue observada en un pequeño número de gallinas. La gallinas infectadas produjeron, a una frecuencia alta, huevos contaminados con S. enteritidis, pero únicamente durante un breve período que se extendió durante aproximadamente una semana después de la inoculación en las gallinas más viejas y durante 2 semanas en las gallinas más jóvenes. La S. enteritidis fue reaislada, a frecuencias similares, del vitelo y de la albúmina de estos huevos, pero no del contenido de la yema. También se produjeron huevos con cáscaras contaminadas pero a una frecuencia más baja. Los huevos contaminados fueron producidos a frecuencias similares por las gallinas infectadas oralmente y las infectadas por contacto.

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